Multiplying camera-back.



lW. F. FOLMER.

MULTIPLYING CAMERA BACK. APPLIUATIN FILED Nov. 23, 1912.

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and forming stops. lll hen the latch is' in co-4 cessively enter apluralityof recesses 23, 24

and 25 provided in the track 'and carriage operation with' the various recesses 23, 2d and. 25, a pointer 26 on an indicatorplate 27, Secured to the carriage, cooperates, respectively, with an equal number of index characters23,' 29 and 30. y@ne of the recesses,

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whenever the plate frame 11 is in the vert-ihowever, namely the recess 25, is litted with ak plug 31 that ts it rather tightly so as to ret-ain any position to which itis moved and when thrust in one direction it completely closes the recess on the tace of 'the tracl; 22, as shown in Figs. 3 and s, against the interlocking engagement of the latch bolt 21 so that the latter will ride over the same and initially engage the succeeding recess 1nl`he plug is moved to this position cal position by virtue et' the engagement therewith of a cam face 32 on a pin 33l ro- ]ecting forwardly. from the front face o the said frame, to register with an -opening 34 in the carriage that communicates with the recess and into which the .end of the plug 31 projectswhen retracted. With the plate frame in the'horizontal position, the pin 33 occupies a blind recess 35 at the other. side of the carriage and the plug `31 can be displaced su'ciently by the bolt portion 21 of the latch to effectively engage within the re'- cess 25. f

In the operation of the device, assuming that two exposures Aare to be made side by side, lengthwise of the plate, the holder 1 1 is arranged in a horizontal position and after focusing is completed, the carriage 4 4is moved to the left on the back frame 1 until the latch bolt 21 automatically engages within the first recess 25, displacing the plug 31 if raised. This brings the plate frame 11 tol the position of Fig. 1. so thatonly half of its i .exposure opening 16 is opposite the expo-- justment,

sure opening 8 of the'diaphragm- 9 in the back frame 1 and only half of the plate, or other sensitized medium, dis osed against said opening 16 is exposed. ith this adthe pointer l 26 indicates the index character 28 showing that the first of two exposures is prepared for. The latch '17 is then lifted so that it will not coperate with .the intermediate recess 24,` but allowed to engage with the last recess 23 halting the plate frame 11 in the' position of Fig. 2 with the remaining or right hand side of its ex-` posure opemng' 16 1n register with abaisse after focusing, the latch bolt 2l will ride over the recess 25 vbecause the plug 31 is being held flush with .the track 22 by the pin 3 3 on the holder frame andthe said latch bolt will engage with the next succeeding recess, 24, instead, bringing the indicator 26 into initial register with the character 29,

lindicating a single exposure and bringing lthe whole plate to a central position in alinement' with the enlarged diaphragm opening. Thus, the mistake .cannot be made of exposing only a art of the late when the whole plate shoul receive t e image. course, it is obvious that the intermediate recess 24C could be similarly tted `with a the latch bolt 21 during a'multiple exposure of thev plate in horizontal position,'so that the latch would not have to be held raised while watching the indicator 123 pass from the-character 28 to the character 30 without stopping at the character 29. A stop pin 36 may be provided on the back frame 1 to be engaged by the shoulder 37 on the carriage 4, or preferably, on the indicator plate 27 secured thereto to prevent the carriage from leaving its guides with an extreme movement to .the left, incase the latch is disenlgaged from the last recess 23, but it is not .relied on 1n the present instance, to define the third position of the carriage,a's it does not -prevent movement of the latter 4in both directions.- Similarly, a stop plate'38 at the i right hand end of the back frame prevents the carriage from leaving its idey in that direction, although it is locke additionally by the engagement of the latch bolt 21 with a fourth recess 39 that defines the proper position of the ground glass screen 10 or focusing.

I cl'aim as my invention:

1. Ina multiplying back, the combinationwith a back frame and a shiftable carriage movable thereon, of a reversible plateframe on the carriage and means for interlocking the back framev and carriagefcontrolled by the position of thev plate frame with reference to the latter.

. 2. In a multiplying back, the combination withV a back frame, a shiftable carriage movable thereon and a locking device for'lialting4 the carriagein a predetermined position,

of a reversible plate frame adapted toasvsume either of two positions on the carriage and tending to render the locking device inoperative when in one of said posltions.

' 3. In a multiplying back, the combination with a back frame, a shiftable carriage movable thereon andmeansfor interlocking the parts comprising an automatic locking devvice on one-part arranged to coperate successively with aplura ity of stops on .the other to halt the carriage in different positions relatively to the back frame, of a re so l plug 31 and the plate frame 11 with another` l v pin 33 to prevent engagementtherewithof versible plate frame adapted to assume either of two positions on the camera and means for preventing the engagement ofthe latch with one of sald stops, said means being rendered op'erative when the plate frame is 1n one position and inoperative when it is in the other. l

4. In ay multiplying back, the combination with a back frame havin an automatic latch thereon, a shiftable carnage movable on the back frame and provided with a stop ranged to be normally engaged by the latch to halt the carriage in one position, of a reversible plate frame adapted to assume either of two positions on the carriage and means actuated upon the reversal ot the late frame for rendering the stop inefective.

5. In a multiplying back, the combination with a back frame having an automatic latch thereon, a shiftable carriage movable 'on the back frame, and a track von the carriage on which the latch runs, said track being provided With a recess forming a stop with which the latch normally coperates to lock the carriage in 'one position relatively to the back frame, of a reversible plate frame on the carriage adapted to assume either of two ositions and a member on the carriage held 1n the recess in the track by the`plate frame when the .latter is in one osition to prevent an eective coperation o the latch and stop.

6. In a multiplying back, the combination with a back frame having a rail and a shiftable carriage movable on, the back frame and havinga track disposed against one side o'f the rail and provided With an aperture forming a stop,of a spring latch mounted onthe opposite side of the rail and embodying a bolt extending through the latter to press against the track on the carriage and normally enter the aperture therein when brought into register therewith to lock the carriage in one position, a plug adapted to fill the aperture in the track and prevent the entrance of the bolt, and a reversible plate frame adapted to assume either of two positionsaon the carriage and to actuate the plug in the aperture when in one of such positions.

A WILLIAM F. FOLMER.

Witnesses:

RUSSELL B. Gfmrrrrn, H. E. STONEBRAKER. 

